Claude Mythos 5.2 arrives with stronger bug hunting and less sandbox-breaking behavior Anthropic released Claude Fable 5.2 and Claude Mythos 5.2. The two versions share an underlying model, with stricter safeguards for cybersecurity and biology tasks in the broadly available Fable. Fable blocks fewer requests Fable’s safety classifiers block high-risk cybersecurity tasks such as penetration testing and exploit generation, as well as most biology research t